v0.7.0 — redesigned CLI, agent logos, shareable dashboard

Added

• Shareable dashboard — sens dashboard now prints Local / Network / Public URLs
  (Vite-style) with a scannable QR code. --host exposes it on your LAN; --tunnel
  creates a public URL via cloudflared or ngrok if either is installed — and when
  neither is found, prints a "How to install" line with clickable links to their
  official pages. Both are opt-in and guarded by an access token in the link, since the
  dashboard can write your config; by default it stays bound to localhost.

Changed

• Redesigned terminal UI — every command now shares one modern look, modeled on
  Claude Code / gh / Vercel CLIs: a consistent sens › <command> header, a braille
  spinner with live status while indexing (resolving to ✓/✗ in place), 2-space
  hierarchy with meaningful glyphs (● ○ › → ⎿), thin ─ separators, rounded summary
  boxes, and color that carries meaning (green ok, red error, yellow warning, gray for
  paths/counts/timings) around a single brand accent. Errors are now a single clear line
  with an optional hint — no raw stack traces unless you pass --verbose. All output is
  centralized in one module (src/cli/ui.ts) so the commands stay visually identical.
  Crucially, this styling is terminal-only: the MCP server and the answering hook
  still return plain text, so nothing here changes (or bloats) what the model reads.
  Internally, picocolors was replaced by chalk + ora + boxen.